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چکیده : 

A time series of remotely-sensed chlorophyll a (chl a) in 1997–2010 was evaluated to determine mechanisms of phytoplankton variation

in recent decade in the South China Sea (SCS) and the western North Pacific subtropical gyre (WNPSG). Satellite-derived sea

surface temperature (SST) and aerosol optical thickness (AOT) were used as proxies for vertical nutrient supply and atmospheric aerosol,

respectively. Chl a in the WNPSG was not significantly correlated with SST (, p > 0.05), but was with AOT (, p < 0.05),

indicating the chl a was influenced by atmospheric deposition. Chl a in the SCS was negatively correlated with SST (r = 0.60, p < 0.05)

and was positively with AOT (, p < 0.05). The correlation between AOT and chl a in the SCS does not reflect a major contribution

from atmospheric deposition to chl a; instead, the relationship resulted from concurrence of the peaks of AOT and wind speed,

which drive water mixing and nutrient supply. Consequently, chl a in the SCS would be regulated primarily by the nutrient supply from

deep waters. Because SST was controlled by the ENSO teleconnection in the SCS, the chl a was coupled with ENSO events. The present

study demonstrated that interannual phytoplankton variation could be controlled by different factors even in neighboring oligotrophic

regions